package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信登录url
    public static final String WECHAT_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;


    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信服务器接口服务，获取openid
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为否为空
        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        // 判断是否为新用户，新用户自动完成注册
        User user = userMapper.getByOpenid(openid);
        if(user==null){
            user= User.builder().openid(openid).createTime(LocalDateTime.now()).build();
            userMapper.insert(user);  //主键返回
        }
        //返回登录成功用户信息
        return user;
    }

    /**
     * 调用微信接口服务，获取openid
     * @param code
     * @return
     */
    private String getOpenid(String code) {
        Map<String,String> params=new HashMap<>();
        params.put("appid",weChatProperties.getAppid());
        params.put("secret",weChatProperties.getSecret());
        params.put("js_code",code);
        params.put("grant_type","authorization_code");
        String json=HttpClientUtil.doGet(WECHAT_LOGIN_URL,params);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
